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  <div class="section" id="steel01-material">
<span id="steel01"></span><h1><span class="section-number">3.4.1.1. </span>Steel01 Material<a class="headerlink" href="#steel01-material" title="Permalink to this headline">¶</a></h1>
<p>This command is used to construct a uniaxial bilinear steel material object with kinematic hardening and optional isotropic hardening described by a non-linear evolution equation (REF: Fedeas).</p>
<dl class="function">
<dt>
<code class="sig-name descname">uniaxialMaterial Steel01 $matTag $Fy $E0 $b &lt;$a1 $a2 $a3 $a4&gt;</code></dt>
<dd></dd></dl>

<table class="colwidths-given docutils align-default">
<colgroup>
<col style="width: 17%" />
<col style="width: 17%" />
<col style="width: 67%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Argument</p></th>
<th class="head"><p>Type</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>$matTag</p></td>
<td><p><em>integer</em></p></td>
<td><p>integer tag identifying material</p></td>
</tr>
<tr class="row-odd"><td><p>$Fy</p></td>
<td><p><em>float</em></p></td>
<td><p>yield strength</p></td>
</tr>
<tr class="row-even"><td><p>$E0</p></td>
<td><p><em>float</em></p></td>
<td><p>initial elastic tangent</p></td>
</tr>
<tr class="row-odd"><td><p>$b</p></td>
<td><p><em>float</em></p></td>
<td><p>strain-hardening ratio (ratio between post-yield tangent and initial elastic tangent)</p></td>
</tr>
<tr class="row-even"><td><p>$a1</p></td>
<td><p><em>float</em></p></td>
<td><p>optional: isotropic hardening parameter: increase of compression yield envelope as proportion of yield strength after a plastic strain of $a2*($Fy/E0).</p></td>
</tr>
<tr class="row-odd"><td><p>$a2</p></td>
<td><p><em>float</em></p></td>
<td><p>optional:isotropic hardening parameter (see explanation under $a1)</p></td>
</tr>
<tr class="row-even"><td><p>$a3</p></td>
<td><p><em>float</em></p></td>
<td><p>optional: isotropic hardening parameter: increase of tension yield envelope as proportion of yield strength after a plastic strain of $a4*($Fy/E0)</p></td>
</tr>
<tr class="row-odd"><td><p>$a4</p></td>
<td><p><em>float</em></p></td>
<td><p>optional: isotropic hardening parameter (see explanation under $a3)</p></td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>By default there is no isotropic hardening.</p>
</div>
<div class="align-center figure" id="id1">
<span id="fig-mdof"></span><img alt="../../../../_images/Steel01.gif" src="../../../../_images/Steel01.gif" />
<p class="caption"><span class="caption-number">Fig. 3.4.1.1 </span><span class="caption-text">Steel01</span><a class="headerlink" href="#id1" title="Permalink to this image">¶</a></p>
</div>
<div class="align-center figure" id="id2">
<img alt="../../../../_images/Steel01HystereticA.jpg" src="../../../../_images/Steel01HystereticA.jpg" />
<p class="caption"><span class="caption-number">Fig. 3.4.1.2 </span><span class="caption-text">Steel01 Material – Default Hysteretic Behavior (NO isotropic hardening)</span><a class="headerlink" href="#id2" title="Permalink to this image">¶</a></p>
</div>
<div class="align-center figure" id="id3">
<img alt="../../../../_images/Steel01HystereticB.jpg" src="../../../../_images/Steel01HystereticB.jpg" />
<p class="caption"><span class="caption-number">Fig. 3.4.1.3 </span><span class="caption-text">Steel01 Material – Hysteretic Behavior of Model with Isotropic Hardening in Compression</span><a class="headerlink" href="#id3" title="Permalink to this image">¶</a></p>
</div>
<div class="align-center figure" id="id4">
<img alt="../../../../_images/Steel01HystereticC.jpg" src="../../../../_images/Steel01HystereticC.jpg" />
<p class="caption"><span class="caption-number">Fig. 3.4.1.4 </span><span class="caption-text">Steel01 Material – Hysteretic Behavior of Model with Isotropic Hardening in Tension</span><a class="headerlink" href="#id4" title="Permalink to this image">¶</a></p>
</div>
<div class="admonition-example admonition">
<p class="admonition-title">Example</p>
<p>The following is used to construct a Steel01 mataerial with a tag of <strong>1</strong>, a yield strength of $60.0** and an initial tangent stiffness of <strong>30000,0</strong>.</p>
<ol class="arabic simple">
<li><p><strong>Tcl Code</strong></p></li>
</ol>
<div class="highlight-tcl notranslate"><div class="highlight"><pre><span></span><span class="nv">uniaxialMaterial</span> Steel01 <span class="mf">60.0</span> <span class="mf">30000.0</span>
</pre></div>
</div>
<ol class="arabic simple" start="2">
<li><p><strong>Python Code</strong></p></li>
</ol>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">uniaxialMaterial</span><span class="p">(</span><span class="s1">&#39;Steel01&#39;</span><span class="p">,</span><span class="mf">60.0</span><span class="p">,</span><span class="mf">30000.0</span><span class="p">)</span>
</pre></div>
</div>
</div>
<p>Code Developed by: <a class="reference external" href="https://cce.oregonstate.edu/scott">Michael H. Scott</a></p>
</div>


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